Just to "add on" to Richard's comments...(good stuff I might add)
Florida's castle doctrine would have sealed his fate if it were me. As Richard says, always be "armed". As soon as the yoyo was discovered in my driveway would have warranted the call to authorities as our "compound" has controlled access which would indicate unlawful tresspass raising the preverbial hair on the back of the neck which in turn raises the "tactical awareness" level. At that point it becomes a "what if" scenario but, if that azzhat so much as "pulled" any sort of weapage....
Who knows, ..heh, I know however!
One of those "guess you had to be there" type situations. Every "confrontation" has its idiosychrosies, however, there is NO excuse for improper action to willfully place you or someone else in danger.
This person made mistakes that may have cost him his life. I hope he survives obviously but we also must understand "we were not in his shoes" at the time. Its a shame that it happened. Being complacent was his mistake.
Wifey and I always stay diligent about our surroundings and also "perform" scenario" and "what if" training. Even if its only verbal...It works. We also employ a tiered passive security system of physical observation, video, motion sensors etc. and barrier deterrence (stategically placed thorn bushes, ornanental pickett fences etc and the controlled access gate mentioned above. Our situation allows this but understand that others properties may not. In that case your "tiered" and "thought out" actions change to meet the potential threat based upon the physical layout of your property and what not.
In final, we live in the middle of a state forest on some private land leftover from a time past, that being said, we are a little more cautious due to hunting activities in our area which obviously constitutes everyone being "armed". So that coupled with the remote location, my reaction situation has been modified somewhat as I know its going to be more than a few minutes for authorities to arrive. Being an ex mil type and being involved with sniping, I even have a detailed "range card" with accurate distances, potential cover and defilade points well marked and no, I'm not a whacko!...
In short, everyone's situations are different but there is NO EXCUSE for NOT having a plan. Even a simple plan is better than nothing and only takes a short time to develop "something"!
OK...I'll clam up now....